Leonardo DiCaprio and Victoria’s Secret model Erin Heatherton can’t keep their hands off each other. “It is nonstop PDA,” a source said of their hot-and-heavy relationship. DiCaprio introduced Heatherton to his mother, Irmelin, over a well-behaved New Year’s Day brunch at the Four Seasons Hotel in Los Angeles. “The meeting went well, and Mom and Erin were seen laughing,” our source said. Leo is very close to his mom, whose approval is key to his relationships.